This is great... but I am torn because, as someone who has spent a lot of time with databases, I feel like there are many mistakes that can lead to confusion.

This is great... but I am torn because, as someone who has spent a lot of time with databases, I feel like there are many mistakes that can lead to confusion. First, it's not teaching standard SQL, it appears to be teaching MySQL. That means any user who tries out any other system will immediately run into confusing error messages about the double quotes. Not ideal, and totally unnecessary -- sticking to standard SQL should work reasonably well in MySQL anyway (at the beginner level, at least). Second, in the section "Creating Tables and Inserting Data", the teacher jumps into surrogate keys immediately. Again, I feel that is unnecessary and will just lead to confusion. The beauty of a relational database is that it connects with the real world; and having arbitrary numbers floating around destroys that beauty. I really hate to criticize, because I really support the effort. Hopefully my feedback is useful.